During the first few days the bladder and urethra may show evidence of mild trauma sustained at delivery although these changes are usually associated with localized oedema. These are transient and do not remain in evidence for long. The changes that occur in the urinary tract during pregnancy disappear in a similar manner to other involutional changes and within 2-3 weeks the hydroureter and pelvic dilatation in the kidney are almost eliminated and completely return to normal by 6-8 weeks post-partum.
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The first trimester is very important for the mother and the baby. For most women it is common to find out about their pregnancy after they have missed their menstrual cycle. Since, not all women note their menstrual cycle and dates of intercourse, it may cause slight confusion about the exact date of conception. That is why most women find out that they are pregnant only after one month of pregnancy.